Information disclosure in Composer
CVE-2026-45793
Composer is a dependency Manager for the PHP language. Prior to 1.10.28, 2.2.28, and 2.9.8, Composer\IO\BaseIO::loadConfiguration() validates GitHub OAuth tokens with the regex ^[.A-Za-z0-9_]+$ and interpolates rejected tokens into an Unex…
Vulnerability class: Information Disclosure
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Composer — versions >= 1.0, < 1.10.28, >= 2.0.0, < 2.2.28, >= 2.3.0, < 2.9.8
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-45793?
- CVE-2026-45793 is a high-severity vulnerability in Composer, classified under Information Disclosure. CVSS score: 7.5/10. Published 2026-07-15.
- How severe is CVE-2026-45793?
- High severity. CVSS v3 base score is 7.5 out of 10.